TRG1 Analog Trigger Module
■The TRGl Analog Trigger Module (Figure 1) contains circuitry for one channel of real-time, hardware-based triggering of analog data acquisition. The TRG1 module is designed for use with the Keithley AMM1A or AMM2 Analog Master Measurement module, revision D or later, which will be referenced hereout as “AMM module”.
■The TRG1 controls the AMM module's high-speed “auto-acquire” mode which is driven by a crystal oscillator located on the AMM. The TRG1 provides an A/D start signal which travels over a dedicated pathway and initiates A/D conversion on the AMM module. As an alternative to triggering on an analog input, the TRG1 can also initiate A/D conversion in response to a global strobe command sent from the data acquisition mainframe.
■The TRG1 module has input ranges of 0 to + 1V, 0 to -1V, 0 to +10V, and 0 to -10V with an input resistance of 10 megohms. Coupling is selectable for AC or DC signals. Input signals are applied to the TRG1 external signal input through a quick-disconnect screw terminal block located on the module, or to the TRG1 global amplifier input via a cable which connects to the AMM global amplifier output. The TRG1 triggering threshold is set by a programmable, 8-bit D/A converter. A programmable low-pass falter provides input filtering with eight cut-off frequencies from 300Hz to 1MHz. This filter can be used to eliminate noise on the trigger signal which may otherwise cause false triggering.
■Beside starting an A/D conversion, the TRG1 trigger signal can also assert an Interrupt Request (IRQ) to the host computer via the IBIN interface card, which can then be used to implement special-purpose, user-written service routines. Check the documentation and revision level of your IBIN interface to determine whether this feature is implemented on the IBIN.
■The number of possible trigger configurations is a function of the number of TRG1 modules in the system, and how the mode, reset, and cycling features are programmed. These programming tasks are handled automatically by higher-level languages such as Keithley's KDAC500
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Analog Trigger Module 、 Analog Master Measurement module 、 interface |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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1989 |
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Rev. A |
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501-917-01 |
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2 MB |
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